Hideo Kojima, Metal Queer Solid 2 'Envisioner' wrote:

There's this thing called the camouflage index, it's what kind of camouflage gear you wear, how you paint your face, against what background you stand, all this will really vary whether or not the enemy will see you or you'll see the enemy. So, this will really add to the stealth element of the game. And you know, the theme of the game obviously is the jungle, but also survival in the jungle, so what you have to do is hunt for food. So, not only are the humans enemies, but you have bugs and animals, and not only are they enemies, but they can be your food. So if you hide wisely, correctly using the camouflage index, you might be able to catch animals that normally you cannot catch. For example, if you see a venomous snake, you can eat it or throw it at an enemy.